搜索框UISearchController的使用(iOS8.0以后替代UISearchBar + UISearchDisplayController）

1.searchResultsUpdater：设置显示搜索结果的控制器

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2.dimsBackgroundDuringPresentation：设置开始搜索时背景显示与否

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3.[searchBar sizeToFit]:设置searchBar位置自适应

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4.设置searchBar为UITableView的头部视图

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5.UISearchResultsUpdating:代理方法

#import "SearchViewController.h"

@interface ShareViewController ()<UISearchResultsUpdating,UITableViewDataSource,UITableViewDelegate>

@property (nonatomic, strong) UITableView *myTableView;

@property (nonatomic, strong) NSMutableArray *visableArray;//可见的

@property (nonatomic, strong) NSMutableArray *filterArray;//滤波器

@property (nonatomic, strong) NSMutableArray *dataSourceArray;

@property (nonatomic, strong) UISearchController *mySearchController;

@end

@implementation SearchViewController

- (void)viewDidLoad {

[super viewDidLoad];

[self initial];

}

- (void)initial{

self.dataSourceArray = [NSMutableArray array];

self.filterArray = [NSMutableArray array];

for (int i = 0; i < 26; i++) {

for (int j = 0; j < 4; j++) {

NSString *str = [NSString stringWithFormat:@"%c%d", 'A'+i, j];

[self.dataSourceArray addObject:str];

}

}

self.visableArray = self.dataSourceArray;

self.myTableView = [[UITableView alloc] initWithFrame:self.view.bounds style:UITableViewStylePlain];

_myTableView.delegate = self;

_myTableView.dataSource = self;

[self.view addSubview:_myTableView];

self.mySearchController = [[UISearchController alloc] initWithSearchResultsController:nil];

_mySearchController.searchResultsUpdater = self;

_mySearchController.dimsBackgroundDuringPresentation = NO;

[_mySearchController.searchBar sizeToFit];

self.myTableView.tableHeaderView = self.mySearchController.searchBar;

}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{

if (!_visableArray || _visableArray.count == 0) {

_visableArray = _dataSourceArray;

}

return _visableArray.count;

}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"identifier"];

if (!cell) {

cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"identifier"];

}

cell.textLabel.text = [_visableArray objectAtIndex:indexPath.row];

return cell;

}

- (void)updateSearchResultsForSearchController:(UISearchController *)searchController{

NSString *filterString = searchController.searchBar.text;

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF contains [c] %@", filterString];

self.visableArray = [NSMutableArray arrayWithArray:[self.dataSourceArray filteredArrayUsingPredicate:predicate]];

[self.myTableView reloadData];

}